Gravastar: An alternate to the Black holes!
A gravastar is an object hypothesized in astrophysics as an alternative to the black hole theory by Pawel Mazur and Emil Mottola. It results from assuming real, physical limitations on the formation of black holes. These limits, such as discrete length and time quanta (chronon), were not known to exist when black holes were originally theorized, so the concept of a gravastar is an attempt to "modernize" the theory by incorporating quantum mechanics. The term gravastar is a portmanteau of the words Gravitational Vacuum Star.
In a gravastar, the event horizon is not a well-defined surface. Each wavelength of light has its own 'event horizon', inside which an observer in flat space-time would never measure that wavelength because of the gravitational red shift. The thick layer of Bose–Einstein condensate would lie just outside the 'event horizon', being prevented from complete collapse by the inner void, exerting a balance pressure outwards on the condensate.
Theoretical support for the feasibility of gravastars does not exclude the existence of black holes as shown in other theoretical studies.
0 comments:
Post a Comment